PLEASE HELP

1. A company makes tranquilizers. It is assumed that the distribution for the length of time they last is approximately normal. Researchers in a hospital used the drug on a random sample of nine patients. The effective period of the tranquilizer for each patient (in hours) was as follows:

2.7; 2.8; 3.0; 2.3; 2.3; 2.2; 2.8; 2.1; and 2.4.

Construct a 95% confidence interval for the population mean length of time that the effect of the tranquilizer lasts, and explain in complete sentences what the confidence interval means.

2. Empty seats on flights cause airlines to lose revenue. If a large airline wants to estimate its mean number of empty seats per flight over the past year. To accomplish this, the records of 225 flights are randomly selected and the number of unoccupied seats is noted for each of the sampled flights. The sample mean is 11.6 seats and the sample standard deviation is 4.1 seats.

Construct a 92% confidence interval for the average number of unoccupied seats, and explain in complete sentences what the confidence interval means.